condition mean min max ZT0-3 8.979052500000002 7.124045000000001 10.834060000000001 ZT4-7 17.05325 17.05325 17.05325 ZT8-11 28.0596 28.0596 28.0596 ZT12-15 0 0 0 ZT16-19 30.43835 30.43835 30.43835 ZT20-23 21.41785 21.41785 21.41785